<div style="position:relative;">
  <img src="img/help.jpg" alt="" width="100%">
  <div class="goto-button" ui-sref="search"></div>
</div>

<style>
  body{
    padding-bottom:0 !important;
  }
  .goto-button{
    width: 60%;
    height: 1.5rem;
    background: url(img/goto-bg.png)no-repeat;
    background-size:100%  1.5rem;
    position: absolute;
    bottom:2.8rem;
    left:20%;
  }
</style>